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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afef53eb9f121baa4e06c1caedaf174b9968a2347760083c4bb51232248e4a91' 
  AND token = 'XhUiiZRUbyc2TMbk/Udca5z1D3tECaPORDmVkTqTQeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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