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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb42ec437f802c04bba78caced17fc43fc9a6bb5e8fb3ca477e958895988687' 
  AND token = 'IteMemq2j7JO5iv6ebJ2HV4y1KHrFnWoshyeT45tvWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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