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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32468a77a50e8ca66d90baed4a546a468fd5d4d43b8cb032bf58397d0f4fe4b3' 
  AND token = '2Sc2gji6BXHCU3933EgKBN1OpSx3YyfCW4i3C/vw9pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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