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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0dd0eb250b5ffb85f446be8844ba8b99599bc73fcb0730b3dd906922ba8d12' 
  AND token = 'yjBvyKQpECWdsxGYldgb5CHPDMJIjNichTeDd3j7rKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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