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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bd6581d9a0c5c47825c7bf6cf889cc4e96ae615f47a35fed44f0fa288668ce' 
  AND token = 'k2Fak0UHhhzrVA+wOvAS5PRl0t2PetFRK1DcpFGay9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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