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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c7021a175f908ee6ca04030751ece1a925dedaf02a7061a0a28c555ec8450c' 
  AND token = 'QFNyVw+eruvGy5OG32ONsREVbSL94EI5I9b2c9XCRBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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