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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11890a5715a8e562c0c91a4fddcfed03fb043618c7c8c4d0ec084dfb46be00fd' 
  AND token = 'yBl9c9GWHDreqPft4BxINVYH54dAWUDWJtp/NFGJ1nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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