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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8838600281ecec682f253d0576382b785716ddc732c92bb292ca9b2039d118' 
  AND token = '6Alb8uxuFQh7I80t7m2Gn1I15Q/bWOL5/Xs4+KEgCHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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