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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6edaf7247bef88841daad0686e1bf94fe762de2cbcf4d1f115cd03477409ac' 
  AND token = 'OXQ5dyNHJp2DBavRXKyUekUDoFOuEGj393gMsMzzxwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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