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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b874d6d0c2e9a9a45363f5bf4ede0e1fb93458f090dfd95eaa84fc13b0504d6' 
  AND token = '+7W5l686LO3pGFkmHAZ35E8qB2z04V3PR66oSZAGqn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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