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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0394a2baea8c558141f34b8d3b92da1f170130a90de0c59de51368d2b2663ef0' 
  AND token = 'aCkeyq0okvFwJ1gTI+9Th6n82yeIA5PLZAv1OAbruCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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