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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e10d1dd9d3aea11864faab5e0abaf96c778c104631c3fdb3e84492a7952b0e' 
  AND token = 'YuAv/e54cNVffigaYpR50FHNQLrSo0+8NU1FdSOAtps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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