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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a6b45e2f935d4b50aa5d40c59608af58a361522abb4cbf11f5e8051b22bfd7' 
  AND token = 'hOvd8mqQqVGYGymaqTGsnaE8TrHMT1xjCytuj1PGATE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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