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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb568f6e74090a9cf511f0e22c5888e2e24f4519993d190bc55c5a079d93afb4' 
  AND token = 'iZgRf69cwLqp9YpEYdkZInTPdb+GsvoUx0nVkoPidrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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