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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1166d82d455e6f4c548a8fffcabb7cbafa6b5ef9f337272d20e65b7d9b1fad' 
  AND token = 'C8B3l7TZh37Qtd+f6oS8pZyqIRec7hEp/hJwXr7CH/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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