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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd409a5388e9d667d14271531980f9bb59d576d66004273f84f291774b7489692' 
  AND token = 'N1wTuekbib9qLVkWSilG1WcnJU4cY4Nl4tcmXeiaE/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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