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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9121605dab89cbd0066f1a4543e2c516acf3699a94a215b91c108618b3adfb8' 
  AND token = 'NSdXGHM849br6aSwU1PdSkZ8Oj1EFlDR6L2fC1VZ/ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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