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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e330e99208aafc1f908f331c31c7b6fbcb40fac33a625cb4cc5199ec7f1780' 
  AND token = 'KN8C4AS53mHR4ASxAggF8BytTkTLRq+rxLCSwkRUeco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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