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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99db08e353db2453c3028d67446b10885c5d7b2d41bbb9e7d580eaa267dfc1b5' 
  AND token = '9R4VciFLwKjVzSmeUNTBFPxeuzvWSqYET5CO3lE0fNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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