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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f23bf18e6b48faf408341da99ed3661eaf14e1c89acef8cac00c5298ef2eeaa' 
  AND token = 'CVsYx52kWIG+nbC92agOui9r+bur16lJzng4MaLm3IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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