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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27803145464a101de25d9ce01ceec65e0310dad79eb56f1c50ab26cc8ddd6063' 
  AND token = 'SNIT+gIrInvLbOIk+pRNv0CC+Tj6eg+o0rz1vL25rWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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