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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32992090f37884e2c11f08d41c8fa1a3129592f489c0096dc1df42052461d30d' 
  AND token = 'fBq5fAEQxiaYN7VuhQ6bZyGBfaiiE7mpKz2eg+viB1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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