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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a240e7e14958dd7c42f063b099d7810518385a19f9266264ec261773dc0230b8' 
  AND token = '8Ex0tfiOf73bpomIa1Axifm8FwPLIlb8eeYqD/iGYoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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