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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999b155e67c64cb3bd6d7e0454502c21de56ae15f8d41049dfe965fe0047b62a' 
  AND token = '/YpUq5B5Uu8q3WqnPQnt1uRFe0nWnvcS1xOQCeNLi/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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