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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f032006a48ce215e9720ace7eb02110ff9fa9718f249b57efb1f69bf36755259' 
  AND token = 'Daj3Vl93+8LfOxFlD7eT32C9xvCGCsqq0/ooNGpxgbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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