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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3baea0d74f1a1dfba56cdd4f5e4a4c2d2f0b8ec4f248c0bc86cd95e6ff0017d4' 
  AND token = 'nDC+TX/SpML3S+4OVRTeZJ3yBDiFyzknv7wnmd/JSmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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