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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dbc52fae723904d4d5347d203dc26c8393ef52de9c6220e444cfa400898783' 
  AND token = 'NopuwP1TajHwYp59Nf/MGhJLFudJIb/WcScCr1g1RZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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