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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c123083ad02f9eededb59bd3d38c3be089d3df074e66b2792bf01c538ae8ae' 
  AND token = '1/c2tN2mTRSWro+mBVUJuz2VRocgTYaq6EIbVAcvo3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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