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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da54fb10bf44d91784404c262eb8e246959f3f5cc787a1e40a321bf4998901dd' 
  AND token = 'N+GPjxk3202xCSGYCozie677gEi6244kYLDXQn762gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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