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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa393aba2a7d4d3821fc45a7e6222748d731bce4720a11aebe78f3d4de5eef8a' 
  AND token = 'ygvYolcgliTXI7+yIIwZ66puOD/tH9oy2d2AJbA6yhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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