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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd2987be33f923ae2d9214fffe084d2307d506804e8ddf33137d6f3621337ed' 
  AND token = '1ey4Fj82gSiBZkqWSkzM95xvEYC7LXDVLBqU8V5AeqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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