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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea27300e79b307dc7cc427491432f0299d51ee6f9c329ac90f0e9d6f7874bde' 
  AND token = 'Xhc4WE6TFBkFeGfyCuK1q3AoiRFTJWkgRhvCxAuG7L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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