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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0217952845c5b33b7aed619f07ab5e18d723e76aa3447b6274f9a33f5e6a73d' 
  AND token = 'IvcSYV0/Nq/cFFjvLfvnejC2Nus5n3Gfmf6D2/HmCbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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