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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ec15f7525150d0af690a8571bf94b45bb1c010a9b10046759bcff1b330c0e2' 
  AND token = 'ngstBRC7KvjMfvQN6IO3rX5rzJOyAC4lL2fMhErQlPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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