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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c82abc74f34e3d1a8439710590cc90fcb614299d70c1c589cc7a31a5d869ddc' 
  AND token = 'pKNq9E4+qOONVM094LJvuo74Zt2JBAGsa4tZFNxMfV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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