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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1db2def5188835513f573ec13f17c0f0eedccd4385d84ba8df3b453207dfd4e' 
  AND token = 'NjpWfEn9snZV+t1DU8CsBPve7CMY9MyuhzHMwUCX5No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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