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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52c9e78f2486f9b05b2cee2808ca0700c99cf2f45644283a6d1a0e04063e917' 
  AND token = 'ptvCevzcfO3irCJuKrK8da0+EW3hmZ7sMjVzNz80dJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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