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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a895d009ce7f5a2c6ebc654e7c0b4b5bcf36b901ceee6de3debf0d0fd6d3a2' 
  AND token = 'D7V1WIMD9AYVRCImMLu9nnT5xOrKWSYzXRvPUNWkv3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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