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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb511cde358508d2a2345e6a220c2775732de316beb3c544dd112ed26864e388' 
  AND token = 'dixH3sz6xd9UThWGNGC/qeoCoX2eR80JLFqgQYvC4kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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