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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c9fc5bde28dc1acbf7e44c871ba84052812c82d3d98979f26e1ee7040632b7' 
  AND token = 'Ft3tQ0IblNcsSA4qdtcyoDOi3+SugF7A0ocKZCjBOVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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