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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158b1101d7781da37e2e6afb5c8744fed4003e12c99108c64dd5722d420c5fdf' 
  AND token = 'gJO0AGvr5HvlMfMIDinkWfV+Fh2X1GrvNKtH0/Rrn6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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