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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a094e04524cf74df64cdabbfe6837b5024a4db09d7fe056b499e40a1f7461959' 
  AND token = 'ZcK13F7O9bNgMpbI/lxHO5jgi9TRARR1cOUrDHPmE1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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