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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a746bed64fa616ea87c5dc1f7a9dc7b5c1893e92a32bcdbadb38b2a086f907b' 
  AND token = '7KZbEJo8yRpVL0tU0dfWoEXCC+0E0NWjpD40dRCmYLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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