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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7170a6e5d5e6e7623f8c18e8498ad6812a2eada674c93dffc073673b2ae25ce' 
  AND token = '2Tb7xDARLr314fXSvQeeeLvEFlOALccgEuu1HfPCQEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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