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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fb905582e34d7e6000f9a67f01266791afc0ba020e8de6428773558f6027d5' 
  AND token = '9Q0q7S5m/e5mG+q1Hib3adXVyukm4Mg8zmuE3nAVHKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}