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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31bb7e4e393f76e2e188f1b1fc4373a42ad8b1906b409c099f97f67522d2e56' 
  AND token = 'iATvvN4ea4u1E3XhU4m448lw/Ukmuz9dK0Hlpri/rfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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