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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc52494b4cf83a1462b51ee09988434d75d21a7702a45f87562268211187869' 
  AND token = 'CVCUuoJKpwCG2R2Atp/YnaSwkx54KM7AofhO6+FRJbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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