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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3a6cd5b4e1a7a5512e6d3dffc96b4c9cea1b94948ce53faf52eded0abb4a11' 
  AND token = 'ZEf3wIVnkPVw6ejEDFDs8VvPgBHGwLAN2WWL3hRAakU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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