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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e028e5d864b426f5c14694e86aca66ef16509475124938187dc621f3ffdb3a' 
  AND token = 'MUm+rK+QO8l7L7an4crI571ekBAAnYXZqx47EdU7JfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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