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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a566a9039a7240a864fd41cad9da40f600d2166ee653b982f3e4a5ecf635b02' 
  AND token = 'jdBFK2koQz3YHU34wOSAwy6ok2wovcw2n3BFmuJV+zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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