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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e494e9a6fa9eec0d5da1120a831cb852c83abc7461a0dc2980b978fcbb0215e' 
  AND token = 'MFnmeACLVeZL8oiQzqlRhVBYXwBshnZe4dnBOKy7yh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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