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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac43086560a50a2b1986bf0f7467cabe44ef9724eee83f23a6c42b19456cd5a' 
  AND token = 'GZL+YshHbquE9E53R4CkTGi0/qi5vMFeXDnfJOR8v44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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