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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51015c823b12795a0b4216a5ef79c98dbdf7fc33f74a9e2d921d41a9fab87123' 
  AND token = 'bDJyshmPD2hW3LCF3J3W/p5RdDXal3cPLQZ3cpjdlis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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