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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553edace0f60309a29bb4120aaf8c9b306178fea2d18fad879b1764d5b4879b9' 
  AND token = 'iz2NSF9nkSNbDiakt8L6+tzpFPegKkEUa1Dfgc4XAaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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