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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f600e837f5359a968129fb45e8a3618e6c9f565255ea1a2a115568ba833fcc11' 
  AND token = 'zLTs+y4nqS7g20UGm8t9FeuFybSY9Q7lpyelU+vxj48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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