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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41acdc451dd0c76f20c0391065c9f49b972f2cf3b4741affdd08464a69369d0' 
  AND token = 'ps/NISfKNgBPVLVP3LShAUfoDnX1cqmnkWeELx2zFxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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