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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66acaeef55025070f302e67d94cf2ac9526a33e4e9e30701297126085ddaabc' 
  AND token = 'aqSk+WWH8HLTf4NRsyD7BbuKt+1vcFsNSdXgnG5KPbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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