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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef90769fec5b7574d31f1559a592f3501be7e7264bbe1a3f71333aae485c6fd8' 
  AND token = '4XBFmRG4PgNX1YFnwSopjHGOdEiYPTzUBud2C5MRMcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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